Sound propagation direction control using three configurations of two-dimensional loudspeaker arrays

In this paper, several configurations of two-dimensional loudspeaker arrays for a system for controlling the sound propagation direction are proposed and the directivities of these array configurations are discussed. The system is theoretically based on the boundary surface control principle. Three loudspeaker arrangements (cross-shaped, circular, and square-matrix) and two control sensor configurations (circle and elliptic) are tested by numerical simulations. The results indicate that the square-matrix loudspeaker array has the highest directivity. Based on this, a real prototype of a square-matrix loudspeaker system is constructed. The measured directivity characteristics of the prototype are similar to those estimated by the numerical simulation.